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105 lines
3.3 KiB
105 lines
3.3 KiB
6 years ago
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'\" t
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.\" Title: zmq_msg_get
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.\" Author: [see the "AUTHORS" section]
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.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
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.\" Date: 09/14/2016
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.\" Manual: 0MQ Manual
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.\" Source: 0MQ 4.1.5
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.\" Language: English
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.\"
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.TH "ZMQ_MSG_GET" "3" "09/14/2016" "0MQ 4\&.1\&.5" "0MQ Manual"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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zmq_msg_get \- get message property
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.SH "SYNOPSIS"
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.sp
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\fBint zmq_msg_get (zmq_msg_t \fR\fB\fI*message\fR\fR\fB, int \fR\fB\fIproperty\fR\fR\fB);\fR
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.SH "DESCRIPTION"
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.sp
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The \fIzmq_msg_get()\fR function shall return the value for the property specified by the \fIproperty\fR argument for the message pointed to by the \fImessage\fR argument\&.
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.sp
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The following properties can be retrieved with the \fIzmq_msg_get()\fR function:
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.PP
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\fBZMQ_MORE\fR
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.RS 4
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Indicates that there are more message frames to follow after the
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\fImessage\fR\&.
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.RE
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.PP
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\fBZMQ_SRCFD\fR
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.RS 4
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Returns the file descriptor of the socket the
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\fImessage\fR
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was read from\&. This allows application to retrieve the remote endpoint via
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\fIgetpeername(2)\fR\&. Be aware that the respective socket might be closed already, reused even\&. Currently only implemented for TCP sockets\&.
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.RE
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.PP
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\fBZMQ_SHARED\fR
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.RS 4
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Indicates that a message MAY share underlying storage with another copy of this message\&.
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.RE
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.SH "RETURN VALUE"
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.sp
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The \fIzmq_msg_get()\fR function shall return the value for the property if successful\&. Otherwise it shall return \-1 and set \fIerrno\fR to one of the values defined below\&.
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.SH "ERRORS"
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.PP
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\fBEINVAL\fR
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.RS 4
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The requested
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\fIproperty\fR
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is unknown\&.
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.RE
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.SH "EXAMPLE"
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.PP
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\fBReceiving a multi-frame message\fR.
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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zmq_msg_t frame;
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while (true) {
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// Create an empty 0MQ message to hold the message frame
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int rc = zmq_msg_init (&frame);
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assert (rc == 0);
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// Block until a message is available to be received from socket
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rc = zmq_msg_recv (socket, &frame, 0);
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assert (rc != \-1);
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if (zmq_msg_get (&frame, ZMQ_MORE))
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fprintf (stderr, "more\en");
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else {
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fprintf (stderr, "end\en");
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break;
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}
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zmq_msg_close (&frame);
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}
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.SH "SEE ALSO"
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.sp
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\fBzmq_msg_set\fR(3) \fBzmq_msg_init\fR(3) \fBzmq_msg_close\fR(3) \fBzmq\fR(7)
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.SH "AUTHORS"
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.sp
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This page was written by the 0MQ community\&. To make a change please read the 0MQ Contribution Policy at \m[blue]\fBhttp://www\&.zeromq\&.org/docs:contributing\fR\m[]\&.
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